Monitoring the Como Railway Bridge based on dynamic FBG sensor system

2007 ◽  
Author(s):  
Jianzhong Zhang ◽  
Weimin Sun ◽  
G. D. Peng ◽  
Libo Yuan
Keyword(s):  
Sensor System ◽  
Railway Bridge ◽  
Fbg Sensor

scholarly journals Intensity and Wavelength Division Multiplexing FBG Sensor System Using a Raman Amplifier and Extreme Learning Machine

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yibeltal Chanie Manie ◽  
Run-Kai Shiu ◽  
Peng-Chun Peng ◽  
Bao-Yi Guo ◽  
Mekuanint Agegnehu Bitew ◽  
...  
Keyword(s):  
Extreme Learning Machine ◽  
Wavelength Division Multiplexing ◽  
Sensor System ◽  
Bragg Wavelength ◽  
Wavelength Division ◽  
Raman Amplifier ◽  
Fbg Sensor ◽  
Transmission Distance ◽  
Fbg Sensors ◽  
Learning Machine

A fiber Bragg grating (FBG) sensor is a favorable sensor in measuring strain, pressure, vibration, and temperature in different applications, such as in smart structures, wind turbines, aerospace, industry, military, medical centers, and civil engineering. FBG sensors have the following advantages: immune to electromagnetic interference, light weight, small size, flexible, stretchable, highly accurate, longer stability, and capable in measuring ultra-high-speed events. In this paper, we propose and demonstrate an intensity and wavelength division multiplexing (IWDM) FBG sensor system using a Raman amplifier and extreme learning machine (ELM). We use an IWDM technique to increase the number of FBG sensors. As the number of FBG sensors increases and the spectra of two or more FBGs are overlapped, a conventional peak detection (CPD) method is unappropriate to detect the central Bragg wavelength of each FBG sensor. To solve this problem, we use ELM techniques. An ELM is used to accurately detect the central Bragg wavelength of each FBG sensor even when the spectra of FBGs are partially or fully overlapped. Moreover, a Raman amplifier is added to a fiber span to generate a gain medium within the transmission fiber, which amplifies the signal and compensates for the signal losses. The transmission distance and the sensing signal quality increase when the Raman pump power increases. The experimental results revealed that a Raman amplifier compensates for the signal losses and provides a stable sensing output even beyond a 45 km transmission distance. We achieve a remote sensing of strain measurement using a 45 km single-mode fiber (SMF). Furthermore, the well-trained ELM wavelength detection methods accurately detect the central Bragg wavelengths of FBG sensors when the two FBG spectra are fully overlapped.

Ultra-long-distance (230 km) FBG sensor system

2008 ◽  
Author(s):  
Takanori Saitoh ◽  
Kenichi Nakamura ◽  
Yoshifumi Takahashi ◽  
Hiroyuki Iida ◽  
Yoshimitsu Iki ◽  
...  
Keyword(s):  
Sensor System ◽  
Long Distance ◽  
Fbg Sensor

scholarly journals A High Sensitive Micro-Seismic Fiber Bragg Grating(FBG) Sensor System

2011 ◽  
Vol 26 ◽  
pp. 765-771
Author(s):  
Jin-Yu Wang ◽  
Guang-Dong Song ◽  
Xiao-Hui Liu ◽  
Chang Wang ◽  
Tong-Yu Liu
Keyword(s):  
Fiber Bragg Grating ◽  
Sensor System ◽  
Bragg Grating ◽  
Fbg Sensor

FBG sensor system based on wavelength-swept active mode-locking laser with RSOA gain medium

2011 ◽  
Author(s):  
Hyo-jin Kim ◽  
Hwi Don Lee ◽  
Myong Yung Jeong ◽  
Chang-Seok Kim ◽  
Ju Han Lee
Keyword(s):  
Mode Locking ◽  
Gain Medium ◽  
Sensor System ◽  
Active Mode ◽  
Fbg Sensor
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